Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b7c030dbf49a86…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 07:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86a8ecc61ca897957fbc68ec756c5394 SHA-1: a4301a128000fbd5ee8817d476cb8d4e62f42ab1 SHA-256: 19b7c030dbf49a861876be55fc566a85adac48c956ed88ee79f9b28affcf77a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.colormotion.cz/UserFiles/file/67912370997.pdf In PDF document text
    • https://rafaela-motores.com/userfiles/file/gedikawerubisoramila.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161382efca392b---kuvugagagoxezugisififik.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/69231869255.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/1524300771.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/giraloge.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903003513.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/raxamatigad.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/1682451740.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/molobituvakemuwinirip.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddd69be33d---45758337139.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/22123861176.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/bodobeladosu.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/dufisepisomuki.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/65271498359.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/75259472912.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/50054174656.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/41633775769.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/resafubamavalenelikawuru.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/89288096897.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/39425325655.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/22179416797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+emulator+raspberry+pi+4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 16616 bytes
SHA-256: 3758715ac2c5ca8c54b4d834274865b478ffefff908b2fef42a8f8035b1235f2
font_02_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 10964 bytes
SHA-256: 9761b71e5a4a31cb4f804ecfe1bd2c8ab72599ce37ffd3076ab9fa8ba47a9aab

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